[BOLT][NFC] Move BAT::fetchParentAddress to header (#93061)

Unbreak shared build after
#91683

Author: aaupov

bolt/include/bolt/Profile/BoltAddressTranslation.h

@@ -107,7 +107,12 @@ class BoltAddressTranslation {
 
   /// If available, fetch the address of the hot part linked to the cold part
   /// at \p Address. Return 0 otherwise.
-  uint64_t fetchParentAddress(uint64_t Address) const;
+  uint64_t fetchParentAddress(uint64_t Address) const {
+    auto Iter = ColdPartSource.find(Address);
+    if (Iter == ColdPartSource.end())
+      return 0;
+    return Iter->second;
+  }
 
   /// True if the input binary has a translation table we can use to convert
   /// addresses when aggregating profile

bolt/lib/Profile/BoltAddressTranslation.cpp

@@ -547,13 +547,6 @@ BoltAddressTranslation::getFallthroughsInTrace(uint64_t FuncAddress,
   return Res;
 }
 
-uint64_t BoltAddressTranslation::fetchParentAddress(uint64_t Address) const {
-  auto Iter = ColdPartSource.find(Address);
-  if (Iter == ColdPartSource.end())
-    return 0;
-  return Iter->second;
-}
-
 bool BoltAddressTranslation::enabledFor(
     llvm::object::ELFObjectFileBase *InputFile) const {
   for (const SectionRef &Section : InputFile->sections()) {