Fix __hip_fabin visibility

In -fgpu-rdc case, fat binary is embedded as global variable __hip_fatbin.
It needs to have protected visibility to avoid conflict between shared
libraries.

Reviewed by: Siu Chi Chan

Differential Revision: https://reviews.llvm.org/D106571

Fixes: SWDEV-292290

clang/lib/Driver/ToolChains/HIP.cpp

@@ -180,6 +180,7 @@ void AMDGCN::Linker::constructGenerateObjFileFromHIPFatBinary(
   // in several main host machines.
   ObjStream << "#       HIP Object Generator\n";
   ObjStream << "# *** Automatically generated by Clang ***\n";
+  ObjStream << "  .protected __hip_fatbin\n";
   ObjStream << "  .type __hip_fatbin,@object\n";
   ObjStream << "  .section .hip_fatbin,\"a\",@progbits\n";
   ObjStream << "  .globl __hip_fatbin\n";

clang/test/Driver/hip-toolchain-rdc.hip

@@ -14,6 +14,7 @@
 // RUN: 2>&1 | FileCheck %s
 
 // check code object alignment in dumped llvm-mc input
+// CHECK: .protected __hip_fatbin
 // CHECK: .p2align 12
 
 // emit objects for host side path