Revert "[MemoryLocation] Handle memset_pattern{4,8,16} in getForDest."

This reverts commit ac60263.

It looks like the test fails on certain non-Darwin system, even though
the triple is explicitly set to macos. Revert while I investigate.

Author: fhahn

llvm/lib/Analysis/MemoryLocation.cpp

@@ -137,9 +137,6 @@ MemoryLocation::getForDest(const CallBase *CB, const TargetLibraryInfo &TLI) {
   LibFunc LF;
   if (TLI.getLibFunc(*CB, LF) && TLI.has(LF)) {
     switch (LF) {
-    case LibFunc_memset_pattern4:
-    case LibFunc_memset_pattern8:
-    case LibFunc_memset_pattern16:
     case LibFunc_strncpy:
     case LibFunc_strcpy:
     case LibFunc_strcat:

llvm/test/Transforms/DeadStoreElimination/libcalls-darwin.ll

@@ -10,7 +10,9 @@ declare void @memset_pattern16(i8*, i8*, i64)
 define void @test_memset_pattern4_const_size(i8* noalias %a, i8* noalias %pattern) {
 ; CHECK-LABEL: @test_memset_pattern4_const_size(
 ; CHECK-NEXT:  entry:
-; CHECK-NEXT:    [[A_GEP_17:%.*]] = getelementptr i8, i8* [[A:%.*]], i32 17
+; CHECK-NEXT:    [[A_GEP_1:%.*]] = getelementptr i8, i8* [[A:%.*]], i32 1
+; CHECK-NEXT:    store i8 0, i8* [[A_GEP_1]], align 1
+; CHECK-NEXT:    [[A_GEP_17:%.*]] = getelementptr i8, i8* [[A]], i32 17
 ; CHECK-NEXT:    store i8 1, i8* [[A_GEP_17]], align 1
 ; CHECK-NEXT:    call void @memset_pattern4(i8* [[A]], i8* [[PATTERN:%.*]], i64 17)
 ; CHECK-NEXT:    ret void
@@ -46,7 +48,9 @@ entry:
 define void @test_memset_pattern8_const_size(i8* noalias %a, i8* noalias %pattern) {
 ; CHECK-LABEL: @test_memset_pattern8_const_size(
 ; CHECK-NEXT:  entry:
-; CHECK-NEXT:    [[A_GEP_17:%.*]] = getelementptr i8, i8* [[A:%.*]], i32 17
+; CHECK-NEXT:    [[A_GEP_1:%.*]] = getelementptr i8, i8* [[A:%.*]], i32 1
+; CHECK-NEXT:    store i8 0, i8* [[A_GEP_1]], align 1
+; CHECK-NEXT:    [[A_GEP_17:%.*]] = getelementptr i8, i8* [[A]], i32 17
 ; CHECK-NEXT:    store i8 1, i8* [[A_GEP_17]], align 1
 ; CHECK-NEXT:    call void @memset_pattern8(i8* [[A]], i8* [[PATTERN:%.*]], i64 17)
 ; CHECK-NEXT:    ret void
@@ -82,7 +86,9 @@ entry:
 define void @test_memset_pattern16_const_size(i8* noalias %a, i8* noalias %pattern) {
 ; CHECK-LABEL: @test_memset_pattern16_const_size(
 ; CHECK-NEXT:  entry:
-; CHECK-NEXT:    [[A_GEP_17:%.*]] = getelementptr i8, i8* [[A:%.*]], i32 17
+; CHECK-NEXT:    [[A_GEP_1:%.*]] = getelementptr i8, i8* [[A:%.*]], i32 1
+; CHECK-NEXT:    store i8 0, i8* [[A_GEP_1]], align 1
+; CHECK-NEXT:    [[A_GEP_17:%.*]] = getelementptr i8, i8* [[A]], i32 17
 ; CHECK-NEXT:    store i8 1, i8* [[A_GEP_17]], align 1
 ; CHECK-NEXT:    call void @memset_pattern16(i8* [[A]], i8* [[PATTERN:%.*]], i64 17)
 ; CHECK-NEXT:    ret void