Add the new @llvm.nacl.atomic.fence.all intrinsic

test/Transforms/NaCl/rewrite-asm-memory.ll

-; RUN: opt < %s -rewrite-asm-directives -S | FileCheck %s
-; RUN: opt < %s -O3 -rewrite-asm-directives -S | FileCheck %s
-; RUN: opt < %s -O3 -rewrite-asm-directives -S | FileCheck %s -check-prefix=ELIM
-; RUN: opt < %s -rewrite-asm-directives -S | FileCheck %s -check-prefix=CLEANED
-
-; Test that asm("":::"memory"), a compiler barrier, gets rewritten to a
-; sequentially-consistent fence. The test is also run at O3 to make sure
-; that loads and stores don't get unexpectedly eliminated.
-
-; CLEANED-NOT: asm
-
-@a = external global i32
-@b = external global i32
-
-; Different triples encode "touch everything" constraints differently.
-define void @memory_assembly_encoding_test() {
-; CHECK: @memory_assembly_encoding_test()
-  call void asm sideeffect "", "~{memory}"()
-  call void asm sideeffect "", "~{memory},~{dirflag},~{fpsr},~{flags}"()
-  ; CHECK-NEXT: fence seq_cst
-  ; CHECK-NEXT: fence seq_cst
-
-  ret void
-  ; CHECK-NEXT: ret void
-}
-
-define void @memory_assembly_ordering_test() {
-; CHECK: @memory_assembly_ordering_test()
-  %1 = load i32* @a, align 4
-  store i32 %1, i32* @b, align 4
-  call void asm sideeffect "", "~{memory}"()
-  ; CHECK-NEXT: %1 = load i32* @a, align 4
-  ; CHECK-NEXT: store i32 %1, i32* @b, align 4
-  ; CHECK-NEXT: fence seq_cst
-
-  ; Redundant load from the previous location, and store to the same
-  ; location (making the previous one dead). Shouldn't get eliminated
-  ; because of the fence.
-  %2 = load i32* @a, align 4
-  store i32 %2, i32* @b, align 4
-  call void asm sideeffect "", "~{memory}"()
-  ; CHECK-NEXT: %2 = load i32* @a, align 4
-  ; CHECK-NEXT: store i32 %2, i32* @b, align 4
-  ; CHECK-NEXT: fence seq_cst
-
-  ; Same here.
-  %3 = load i32* @a, align 4
-  store i32 %3, i32* @b, align 4
-  ; CHECK-NEXT: %3 = load i32* @a, align 4
-  ; CHECK-NEXT: store i32 %3, i32* @b, align 4
-
-  ret void
-  ; CHECK-NEXT: ret void
-}
-
-; Same function as above, but without the barriers. At O3 some loads and
-; stores should get eliminated.
-define void @memory_ordering_test() {
-; ELIM: @memory_ordering_test()
-  %1 = load i32* @a, align 4
-  store i32 %1, i32* @b, align 4
-  %2 = load i32* @a, align 4
-  store i32 %2, i32* @b, align 4
-  %3 = load i32* @a, align 4
-  store i32 %3, i32* @b, align 4
-  ; ELIM-NEXT: %1 = load i32* @a, align 4
-  ; ELIM-NEXT: store i32 %1, i32* @b, align 4
-
-  ret void
-  ; ELIM-NEXT: ret void
-}