[ProfileData] Support coverage for PE binaries

[davidxl]

Summary

On windows, the section names are limited to 8 chars. This patch fixes PR/32584

The compile-rt part of the change is identical.

[vsk]

Thanks, LGTM! I double-checked that we don't refer to __llvm_prf directly in llvm or clang's {lib, tools} directories, but didn't test this on a win32 machine.

llvm/trunk/include/llvm/ProfileData/InstrProfData.inc

 #define VARIANT_MASK_IR_PROF (0x1ULL << 56)
 #define INSTR_PROF_RAW_VERSION_VAR __llvm_profile_raw_version
 #define INSTR_PROF_PROFILE_RUNTIME_VAR __llvm_profile_runtime
 
 /* The variable that holds the name of the profile data
  * specified via command line. */
 #define INSTR_PROF_PROFILE_NAME_VAR __llvm_profile_filename
 
+#ifdef _WIN32
+/* Runtime section names and name strings.  */
+#define INSTR_PROF_DATA_SECT_NAME .lprfd
+#define INSTR_PROF_NAME_SECT_NAME .lprfn
+#define INSTR_PROF_CNTS_SECT_NAME .lprfc
+/* Array of pointers. Each pointer points to a list
+ * of value nodes associated with one value site.
+ */
+#define INSTR_PROF_VALS_SECT_NAME .lprfv
+/* Value profile nodes section. */
+#define INSTR_PROF_VNODES_SECT_NAME .lprfnd
+#define INSTR_PROF_COVMAP_SECT_NAME .lcovmap
+#else
 /* Runtime section names and name strings.  */
 #define INSTR_PROF_DATA_SECT_NAME __llvm_prf_data
 #define INSTR_PROF_NAME_SECT_NAME __llvm_prf_names
 #define INSTR_PROF_CNTS_SECT_NAME __llvm_prf_cnts
 /* Array of pointers. Each pointer points to a list
  * of value nodes associated with one value site.
  */
 #define INSTR_PROF_VALS_SECT_NAME __llvm_prf_vals
 /* Value profile nodes section. */
 #define INSTR_PROF_VNODES_SECT_NAME __llvm_prf_vnds
 #define INSTR_PROF_COVMAP_SECT_NAME __llvm_covmap
+#endif
 
 #define INSTR_PROF_DATA_SECT_NAME_STR                                          \
   INSTR_PROF_QUOTE(INSTR_PROF_DATA_SECT_NAME)
 #define INSTR_PROF_NAME_SECT_NAME_STR                                          \
   INSTR_PROF_QUOTE(INSTR_PROF_NAME_SECT_NAME)
 #define INSTR_PROF_CNTS_SECT_NAME_STR                                          \
   INSTR_PROF_QUOTE(INSTR_PROF_CNTS_SECT_NAME)
 #define INSTR_PROF_COVMAP_SECT_NAME_STR                                        \