[AIX][PGO] Enable PGO continuous mode support on AIX (#110196)

Author: Wael Yehia

compiler-rt/lib/profile/InstrProfilingFile.c

@@ -196,7 +196,7 @@ static int mmapForContinuousMode(uint64_t CurrentFileOffset, FILE *File) {
   }
   return 0;
 }
-#elif defined(__ELF__) || defined(_WIN32)
+#elif defined(__ELF__) || defined(_WIN32) || defined(_AIX)
 
 #define INSTR_PROF_PROFILE_COUNTER_BIAS_DEFAULT_VAR                            \
   INSTR_PROF_CONCAT(INSTR_PROF_PROFILE_COUNTER_BIAS_VAR, _default)
@@ -862,7 +862,7 @@ static int parseFilenamePattern(const char *FilenamePat,
           __llvm_profile_disable_continuous_mode();
           return -1;
         }
-#if defined(__APPLE__) || defined(__ELF__) || defined(_WIN32)
+#if defined(__APPLE__) || defined(__ELF__) || defined(_WIN32) || defined(_AIX)
         __llvm_profile_set_page_size(getpagesize());
         __llvm_profile_enable_continuous_mode();
 #else

compiler-rt/test/profile/ContinuousSyncMode/runtime-counter-relocation.c

@@ -1,11 +1,11 @@
-// REQUIRES: target={{.*(linux|solaris|windows-msvc).*}}
+// REQUIRES: target={{.*(linux|solaris|windows-msvc|aix).*}}
 
 // RUN: %clang -fprofile-instr-generate -fcoverage-mapping -mllvm -runtime-counter-relocation=true -o %t.exe %s
 // RUN: echo "garbage" > %t.profraw
 // RUN: env LLVM_PROFILE_FILE="%c%t.profraw" %run %t.exe
 // RUN: llvm-profdata show --counts --all-functions %t.profraw | FileCheck %s -check-prefix=CHECK-COUNTS
 // RUN: llvm-profdata merge -o %t.profdata %t.profraw
-// RUN: llvm-cov report %t.exe -instr-profile %t.profdata | FileCheck %s -check-prefix=CHECK-COVERAGE
+// RUN: %if !target={{.*aix.*}} %{ llvm-cov report %t.exe -instr-profile %t.profdata | FileCheck %s -check-prefix=CHECK-COVERAGE %}
 
 // CHECK-COUNTS: Counters:
 // CHECK-COUNTS-NEXT:   main:

compiler-rt/test/profile/ContinuousSyncMode/set-file-object.c

@@ -1,4 +1,4 @@
-// REQUIRES: target={{.*(darwin|linux|solaris).*}}
+// REQUIRES: target={{.*(darwin|linux|solaris|aix).*}}
 
 // Test using __llvm_profile_set_file_object in continuous mode (%c).
 // Create & cd into a temporary directory.