SWDEV-273235 - Fix HIP PCH build

hip_rtc.cpp refers to the symbol __hipGetPCH(), but that one can only be
found in hip_global.cpp. It's not referenced anywhere else, hence it
should be moved.

Change-Id: Ifc67b2f3b1b8344dec0e6c30d083d62288fb5e24


[ROCm/hip commit: 6debae4a14]

projects/hip/rocclr/hip_global.cpp

@@ -5,15 +5,6 @@
 #include "hip_code_object.hpp"
 #include "platform/program.hpp"
 
-#ifdef __HIP_ENABLE_PCH
-extern const char __hip_pch[];
-extern unsigned __hip_pch_size;
-void __hipGetPCH(const char** pch, unsigned int *size) {
-  *pch = __hip_pch;
-  *size = __hip_pch_size;
-}
-#endif
-
 namespace hip {
 
 //Device Vars