PowerPC: Do not use llc -march in tests.

`llc -march` is problematic because it only switches the target
architecture, but leaves the operating system unchanged. This
occasionally leads to indeterministic tests because the OS from
LLVM_DEFAULT_TARGET_TRIPLE is used.

However we can simply always use `llc -mtriple` instead. This changes
all the tests to do this to avoid people using -march when they copy and
paste parts of tests.

This patch:
- Removes -march if the .ll file already has a matching `target triple`
  directive or -mtriple argument.
- In all other cases changes -march=ppc32/-march=ppc64 to
  -mtriple=ppc32--/-mtriple=ppc64--

See also the discussion in https://reviews.llvm.org/D35287

llvm-svn: 309754
diff --git a/llvm/test/CodeGen/PowerPC/2007-03-30-SpillerCrash.ll b/llvm/test/CodeGen/PowerPC/2007-03-30-SpillerCrash.ll
index 717e9c7..7ed1363 100644
--- a/llvm/test/CodeGen/PowerPC/2007-03-30-SpillerCrash.ll
+++ b/llvm/test/CodeGen/PowerPC/2007-03-30-SpillerCrash.ll
@@ -1,4 +1,4 @@
-; RUN: llc -verify-machineinstrs < %s -march=ppc32 -mcpu=g5
+; RUN: llc -verify-machineinstrs < %s -mtriple=ppc32-- -mcpu=g5
 
 define void @test(<4 x float>*, { { i16, i16, i32 } }*) {
 xOperationInitMasks.exit: