Add target REQUIRES to 3 more tests

These tests all need an x86 backend for the correct data layout.

Author: arichardson

llvm/test/Instrumentation/SanitizerCoverage/cmp-tracing-api-x86_32.ll

@@ -1,4 +1,5 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
+; REQUIRES: x86-registered-target
 ; Test -sanitizer-coverage-trace-compares=1 API declarations on a non-x86_64 arch
 ; RUN: opt < %s -passes='module(sancov-module)' -sanitizer-coverage-level=1 -sanitizer-coverage-trace-compares=1  -S | FileCheck %s
 

llvm/test/Transforms/InstCombine/double-float-shrink-2.ll

@@ -1,4 +1,5 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; REQUIRES: x86-registered-target,sparc-registered-target
 ; RUN: opt < %s -passes=instcombine -S -mtriple "i386-pc-linux"     | FileCheck %s --check-prefixes=CHECK,DOUBLE-4BYTE-ALIGN
 ; RUN: opt < %s -passes=instcombine -S -mtriple "i386-pc-win32"     | FileCheck %s --check-prefixes=CHECK,DOUBLE-8BYTE-ALIGN
 ; RUN: opt < %s -passes=instcombine -S -mtriple "x86_64-pc-win32"   | FileCheck %s --check-prefixes=CHECK,DOUBLE-8BYTE-ALIGN

llvm/test/Transforms/NewGVN/refine-stores.ll

@@ -1,4 +1,5 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; REQUIRES: x86-registered-target
 ; RUN: opt < %s -passes=newgvn -S | FileCheck %s
 ;; Now that we do store refinement, we have to verify that we add fake uses
 ;; when we skip existing stores.