[PGO] Use common definition of raw magic and version

- Replace duplicate definition and use of magic in profile runtime
- Replace hard coded version reference in profile runtime

llvm-svn: 253885

compiler-rt/lib/profile/InstrProfiling.c

@@ -13,19 +13,8 @@
 #include <string.h>
 
 LLVM_LIBRARY_VISIBILITY uint64_t __llvm_profile_get_magic(void) {
-  /* Magic number to detect file format and endianness.
-   *
-   * Use 255 at one end, since no UTF-8 file can use that character.  Avoid 0,
-   * so that utilities, like strings, don't grab it as a string.  129 is also
-   * invalid UTF-8, and high enough to be interesting.
-   *
-   * Use "lprofr" in the centre to stand for "LLVM Profile Raw", or "lprofR"
-   * for 32-bit platforms.
-   */
-  unsigned char R = sizeof(void *) == sizeof(uint64_t) ? 'r' : 'R';
-  return (uint64_t)255 << 56 | (uint64_t)'l' << 48 | (uint64_t)'p' << 40 |
-         (uint64_t)'r' << 32 | (uint64_t)'o' << 24 | (uint64_t)'f' << 16 |
-         (uint64_t)R << 8 | (uint64_t)129;
+  return sizeof(void *) == sizeof(uint64_t) ? (INSTR_PROF_RAW_MAGIC_64)
+                                            : (INSTR_PROF_RAW_MAGIC_32);
 }
 
 /* Return the number of bytes needed to add to SizeInBytes to make it
@@ -37,8 +26,7 @@ __llvm_profile_get_num_padding_bytes(uint64_t SizeInBytes) {
 }
 
 LLVM_LIBRARY_VISIBILITY uint64_t __llvm_profile_get_version(void) {
-  /* This should be bumped any time the output format changes. */
-  return 2;
+  return INSTR_PROF_RAW_VERSION;
 }
 
 LLVM_LIBRARY_VISIBILITY void __llvm_profile_reset_counters(void) {