Tests for weighted merge of instrumented profiles.

1- Merge the foo and bar profiles with unity weight and verify the combined output
RUN: llvm-profdata merge -instr -weighted-input=1,%p/Inputs/weight-instr-bar.profdata -weighted-input=1,%p/Inputs/weight-instr-foo.profdata -o %t
RUN: llvm-profdata show -instr -all-functions %t > %t.out1
RUN: FileCheck %s -check-prefixes=1X_1X_WEIGHT,1X_1X_WEIGHT-1 < %t.out1
RUN: FileCheck %s -check-prefixes=1X_1X_WEIGHT,1X_1X_WEIGHT-2 < %t.out1
RUN: FileCheck %s -check-prefixes=1X_1X_WEIGHT,1X_1X_WEIGHT-3 < %t.out1
RUN: FileCheck %s -check-prefixes=1X_1X_WEIGHT,1X_1X_WEIGHT-4 < %t.out1
RUN: llvm-profdata merge -instr -weighted-input=1,%p/Inputs/weight-instr-bar.profdata %p/Inputs/weight-instr-foo.profdata -o %t
RUN: llvm-profdata show -instr -all-functions %t > %t.out2
RUN: FileCheck %s -check-prefixes=1X_1X_WEIGHT,1X_1X_WEIGHT-1 < %t.out2
RUN: FileCheck %s -check-prefixes=1X_1X_WEIGHT,1X_1X_WEIGHT-2 < %t.out2
RUN: FileCheck %s -check-prefixes=1X_1X_WEIGHT,1X_1X_WEIGHT-3 < %t.out2
RUN: FileCheck %s -check-prefixes=1X_1X_WEIGHT,1X_1X_WEIGHT-4 < %t.out2
1X_1X_WEIGHT: Counters:
1X_1X_WEIGHT-1:   usage:
1X_1X_WEIGHT-1:     Hash: 0x0000000000000000
1X_1X_WEIGHT-1:     Counters: 1
1X_1X_WEIGHT-1:     Function count: 0
1X_1X_WEIGHT-2:   foo:
1X_1X_WEIGHT-2:     Hash: 0x000000000000028a
1X_1X_WEIGHT-2:     Counters: 3
1X_1X_WEIGHT-2:     Function count: 866988873
1X_1X_WEIGHT-3:   bar:
1X_1X_WEIGHT-3:     Hash: 0x000000000000028a
1X_1X_WEIGHT-3:     Counters: 3
1X_1X_WEIGHT-3:     Function count: 866988873
1X_1X_WEIGHT-4:   main:
1X_1X_WEIGHT-4:     Hash: 0x7d31c47ea98f8248
1X_1X_WEIGHT-4:     Counters: 60
1X_1X_WEIGHT-4:     Function count: 2
1X_1X_WEIGHT:      Functions shown: 4
1X_1X_WEIGHT-NEXT: Total functions: 4
1X_1X_WEIGHT-NEXT: Maximum function count: 866988873
1X_1X_WEIGHT-NEXT: Maximum internal block count: 267914296

2- Merge the foo and bar profiles with weight 3x and 5x respectively and verify the combined output
RUN: llvm-profdata merge -instr -weighted-input=3,%p/Inputs/weight-instr-bar.profdata -weighted-input=5,%p/Inputs/weight-instr-foo.profdata -o %t
RUN: llvm-profdata show -instr -all-functions %t > %t.out3
RUN: FileCheck %s -check-prefixes=3X_5X_WEIGHT,3X_5X_WEIGHT-1 < %t.out3
RUN: FileCheck %s -check-prefixes=3X_5X_WEIGHT,3X_5X_WEIGHT-2 < %t.out3
RUN: FileCheck %s -check-prefixes=3X_5X_WEIGHT,3X_5X_WEIGHT-3 < %t.out3
RUN: FileCheck %s -check-prefixes=3X_5X_WEIGHT,3X_5X_WEIGHT-4 < %t.out3
3X_5X_WEIGHT: Counters:
3X_5X_WEIGHT-1:   usage:
3X_5X_WEIGHT-1:     Hash: 0x0000000000000000
3X_5X_WEIGHT-1:     Counters: 1
3X_5X_WEIGHT-1:     Function count: 0
3X_5X_WEIGHT-2:   foo:
3X_5X_WEIGHT-2:     Hash: 0x000000000000028a
3X_5X_WEIGHT-2:     Counters: 3
3X_5X_WEIGHT-2:     Function count: 4334944365
3X_5X_WEIGHT-3:   bar:
3X_5X_WEIGHT-3:     Hash: 0x000000000000028a
3X_5X_WEIGHT-3:     Counters: 3
3X_5X_WEIGHT-3:     Function count: 2600966619
3X_5X_WEIGHT-4:   main:
3X_5X_WEIGHT-4:     Hash: 0x7d31c47ea98f8248
3X_5X_WEIGHT-4:     Counters: 60
3X_5X_WEIGHT-4:     Function count: 8
3X_5X_WEIGHT:      Functions shown: 4
3X_5X_WEIGHT-NEXT: Total functions: 4
3X_5X_WEIGHT-NEXT: Maximum function count: 4334944365
3X_5X_WEIGHT-NEXT: Maximum internal block count: 1339571480

3- Bad merge: invalid weight
RUN: not llvm-profdata merge -instr -weighted-input=3,%p/Inputs/weight-instr-bar.profdata -weighted-input=0,%p/Inputs/weight-instr-foo.profdata -o %t.out 2>&1 | FileCheck %s -check-prefix=INVALID_WEIGHT
RUN: not llvm-profdata merge -instr -weighted-input=3,%p/Inputs/weight-instr-bar.profdata -weighted-input=0.75,%p/Inputs/weight-instr-foo.profdata -o %t.out 2>&1 | FileCheck %s -check-prefix=INVALID_WEIGHT
RUN: not llvm-profdata merge -instr -weighted-input=3,%p/Inputs/weight-instr-bar.profdata -weighted-input=-5,%p/Inputs/weight-instr-foo.profdata -o %t.out 2>&1 | FileCheck %s -check-prefix=INVALID_WEIGHT
RUN: not llvm-profdata merge -instr -weighted-input=3,%p/Inputs/weight-instr-bar.profdata -weighted-input=,%p/Inputs/weight-instr-foo.profdata -o %t.out 2>&1 | FileCheck %s -check-prefix=INVALID_WEIGHT
RUN: not llvm-profdata merge -instr -weighted-input=3,%p/Inputs/weight-instr-bar.profdata -weighted-input=%p/Inputs/weight-instr-foo.profdata -o %t.out 2>&1 | FileCheck %s -check-prefix=INVALID_WEIGHT
INVALID_WEIGHT: error: Input weight must be a positive integer.

4- Bad merge: input path does not exist
RUN: not llvm-profdata merge -instr -weighted-input=3,%p/Inputs/does-not-exist.profdata -weighted-input=2,%p/Inputs/does-not-exist-either.profdata -o %t.out 2>&1 | FileCheck -DMSG=%errc_ENOENT %s -check-prefix=INVALID_INPUT
INVALID_INPUT: {{.*}}: {{.*}}does-not-exist.profdata: [[MSG]]

5- No inputs
RUN: not llvm-profdata merge -instr -o %t.out 2>&1 | FileCheck %s -check-prefix=NO_INPUT
NO_INPUT: {{.*}}: No input files specified. See llvm-profdata{{(\.EXE|\.exe)?}} merge -help