[X86] Replace X32 check prefix with X86

We try to use X32 only for gnux32 triple cases

Author: RKSimon

llvm/test/CodeGen/X86/vec_insert-7.ll

@@ -1,15 +1,15 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc < %s -mtriple=i686-apple-darwin9 -mattr=+mmx,+sse4.2 | FileCheck %s --check-prefix=X32
+; RUN: llc < %s -mtriple=i686-apple-darwin9 -mattr=+mmx,+sse4.2 | FileCheck %s --check-prefix=X86
 ; RUN: llc < %s -mtriple=x86_64-apple-darwin9 -mattr=+mmx,+sse4.2 | FileCheck %s --check-prefix=X64
 
 ; MMX insertelement is not available; these are promoted to xmm.
 ; (Without SSE they are split to two ints, and the code is much better.)
 
 define x86_mmx @mmx_movzl(x86_mmx %x) nounwind {
-; X32-LABEL: mmx_movzl:
-; X32:       ## %bb.0:
-; X32-NEXT:    movq {{\.?LCPI[0-9]+_[0-9]+}}, %mm0
-; X32-NEXT:    retl
+; X86-LABEL: mmx_movzl:
+; X86:       ## %bb.0:
+; X86-NEXT:    movq {{\.?LCPI[0-9]+_[0-9]+}}, %mm0
+; X86-NEXT:    retl
 ;
 ; X64-LABEL: mmx_movzl:
 ; X64:       ## %bb.0: