[X86] Migrate tests to use opaque pointers (NFC)

Test updates were performed using:
https://gist.github.com/nikic/98357b71fd67756b0f064c9517b62a34

These are only the test updates where the test passed without
further modification (which is almost all of them, as the backend
is largely pointer-type agnostic).
diff --git a/llvm/test/CodeGen/X86/cmp-bool.ll b/llvm/test/CodeGen/X86/cmp-bool.ll
index 7af03cd..617b485 100644
--- a/llvm/test/CodeGen/X86/cmp-bool.ll
+++ b/llvm/test/CodeGen/X86/cmp-bool.ll
@@ -1,7 +1,7 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=x86_64 < %s | FileCheck %s
 
-define void @bool_eq(i1 zeroext %a, i1 zeroext %b, void ()* nocapture %c) nounwind {
+define void @bool_eq(i1 zeroext %a, i1 zeroext %b, ptr nocapture %c) nounwind {
 ; CHECK-LABEL: bool_eq:
 ; CHECK:       # %bb.0: # %entry
 ; CHECK-NEXT:    xorl %esi, %edi
@@ -22,7 +22,7 @@
   ret void
 }
 
-define void @bool_ne(i1 zeroext %a, i1 zeroext %b, void ()* nocapture %c) nounwind {
+define void @bool_ne(i1 zeroext %a, i1 zeroext %b, ptr nocapture %c) nounwind {
 ; CHECK-LABEL: bool_ne:
 ; CHECK:       # %bb.0: # %entry
 ; CHECK-NEXT:    cmpb %sil, %dil