[InstrProfiling] Add AIX triple to platform test

[jsji]

Summary

We found that AIX was not covered in most of the InstrProfiling tests.
So we are trying to enable the tests gradually.

This is to add AIX triple to platform tests to make sure the
registrations are OK.

llvm/test/Instrumentation/InstrProfiling/platform.ll

 ;; Checks for platform specific section names and initialization code.
 
 ; RUN: opt < %s -mtriple=x86_64-apple-macosx10.10.0 -instrprof -S | FileCheck %s -check-prefix=MACHO
 ; RUN: opt < %s -mtriple=x86_64-apple-macosx10.10.0 -passes=instrprof -S | FileCheck %s -check-prefix=MACHO
 ; RUN: opt < %s -mtriple=x86_64-unknown-linux -instrprof -S | FileCheck %s -check-prefixes=LINUX,ELF
 ; RUN: opt < %s -mtriple=x86_64-unknown-linux -passes=instrprof -S | FileCheck %s -check-prefixes=LINUX,ELF
 ; RUN: opt < %s -mtriple=x86_64-unknown-freebsd -instrprof -S | FileCheck %s -check-prefixes=FREEBSD,ELF
 ; RUN: opt < %s -mtriple=x86_64-unknown-freebsd -passes=instrprof -S | FileCheck %s -check-prefixes=FREEBSD,ELF
 ; RUN: opt < %s -mtriple=x86_64-scei-ps4 -instrprof -S | FileCheck %s -check-prefixes=PS4,ELF
 ; RUN: opt < %s -mtriple=x86_64-scei-ps4 -passes=instrprof -S | FileCheck %s -check-prefixes=PS4,ELF
 ; RUN: opt < %s -mtriple=x86_64-pc-solaris -instrprof -S | FileCheck %s -check-prefixes=SOLARIS,ELF
 ; RUN: opt < %s -mtriple=x86_64-pc-solaris -passes=instrprof -S | FileCheck %s -check-prefixes=SOLARIS,ELF
 ; RUN: opt < %s -mtriple=x86_64-pc-windows -instrprof -S | FileCheck %s -check-prefix=WINDOWS
 ; RUN: opt < %s -mtriple=x86_64-pc-windows -passes=instrprof -S | FileCheck %s -check-prefix=WINDOWS
+; RUN: opt < %s -mtriple=powerpc64-ibm-aix-xcoff -passes=instrprof -S | FileCheck %s -check-prefix=AIX
 
 @__profn_foo = private constant [3 x i8] c"foo"
 ; MACHO-NOT: __profn_foo
 ; ELF-NOT: __profn_foo
 ; WINDOWS-NOT: __profn_foo
+; AIX-NOT: __profn_foo
 
 ; MACHO: @__profc_foo = private global [1 x i64] zeroinitializer, section "__DATA,__llvm_prf_cnts", align 8
 ; ELF: @__profc_foo = private global [1 x i64] zeroinitializer, section "__llvm_prf_cnts", comdat, align 8
 ; WINDOWS: @__profc_foo = private global [1 x i64] zeroinitializer, section ".lprfc$M", align 8
+; AIX: @__profc_foo = private global [1 x i64] zeroinitializer, section "__llvm_prf_cnts", align 8
 
 ; MACHO: @__profd_foo = private {{.*}}, section "__DATA,__llvm_prf_data,regular,live_support", align 8
 ; ELF: @__profd_foo = private {{.*}}, section "__llvm_prf_data", comdat($__profc_foo), align 8
 ; WINDOWS: @__profd_foo = private global {{.*}}, section ".lprfd$M", align 8
+; AIX: @__profd_foo = private {{.*}}, section "__llvm_prf_data", align 8
 
 ; ELF: @__llvm_prf_nm = private constant [{{.*}} x i8] c"{{.*}}", section "{{.*}}__llvm_prf_names", align 1
 ; WINDOWS: @__llvm_prf_nm = private constant [{{.*}} x i8] c"{{.*}}", section "{{.*}}lprfn$M", align 1
+; AIX: @__llvm_prf_nm = private constant [{{.*}} x i8] c"{{.*}}", section "{{.*}}__llvm_prf_names", align 1
 
 define void @foo() {
   call void @llvm.instrprof.increment(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @__profn_foo, i32 0, i32 0), i64 0, i32 1, i32 0)
   ret void
 }
 
 declare void @llvm.instrprof.increment(i8*, i64, i32, i32)
 
 ;; Emit registration functions for platforms that don't find the
 ;; symbols by their sections.
 
 ; MACHO-NOT: define internal void @__llvm_profile_register_functions
 ; LINUX-NOT: define internal void @__llvm_profile_register_functions
 ; FREEBSD-NOT: define internal void @__llvm_profile_register_functions
 ; SOLARIS-NOT: define internal void @__llvm_profile_register_functions
 ; PS4-NOT: define internal void @__llvm_profile_register_functions
 ; WINDOWS-NOT: define internal void @__llvm_profile_register_functions
+; AIX: define internal void @__llvm_profile_register_functions
 
 ;; PR38340: When dynamic registration is used, we had a bug where we'd register
 ;; something that's not a __profd_* variable.
 
 ; MACHO-NOT: define internal void @__llvm_profile_init
 ; LINUX-NOT: define internal void @__llvm_profile_init
 ; FREEBSD-NOT: define internal void @__llvm_profile_init
 ; SOLARIS-NOT: define internal void @__llvm_profile_init
 ; PS4-NOT: define internal void @__llvm_profile_init
 ; WINDOWS-NOT: define internal void @__llvm_profile_init
+; AIX: define internal void @__llvm_profile_init