[AMDGPU] Emit linkonce and linkonce_odr symbols

[• tstellarAMD]

LGTM.

lib/Target/AMDGPU/AMDGPUAsmPrinter.cpp

TS->EmitAMDGPUSymbolType(CurrentFnSym->getName(),
                              ELF::STT_AMDGPU_HSA_KERNEL);
   }
 
   AsmPrinter::EmitFunctionEntryLabel();
 }
 
 static bool isModuleLinkage(const GlobalValue *GV) {
   switch (GV->getLinkage()) {
+  case GlobalValue::LinkOnceODRLinkage:
+  case GlobalValue::LinkOnceAnyLinkage:
   case GlobalValue::InternalLinkage:
   case GlobalValue::CommonLinkage:
    return true;
   case GlobalValue::ExternalLinkage:
    return false;
   default: llvm_unreachable("unknown linkage type");
   }
 }

test/CodeGen/AMDGPU/hsa-globals.ll

 ; RUN: llc < %s -mtriple=amdgcn--amdhsa -mcpu=kaveri | FileCheck --check-prefix=ASM %s
 ; RUN: llc < %s -mtriple=amdgcn--amdhsa -mcpu=kaveri | llvm-mc -filetype=obj -triple amdgcn--amdhsa -mcpu=kaveri | llvm-readobj -symbols -s | FileCheck %s --check-prefix=ELF
 
+@linkonce_odr_global_program = linkonce_odr addrspace(1) global i32 0
+@linkonce_global_program = linkonce addrspace(1) global i32 0
 @internal_global_program = internal addrspace(1) global i32 0
 @common_global_program = common addrspace(1) global i32 0
 @external_global_program = addrspace(1) global i32 0
 
+@linkonce_odr_global_agent = linkonce_odr addrspace(1) global i32 0, section ".hsadata_global_agent"
+@linkonce_global_agent = linkonce addrspace(1) global i32 0, section ".hsadata_global_agent"
 @internal_global_agent = internal addrspace(1) global i32 0, section ".hsadata_global_agent"
 @common_global_agent = common addrspace(1) global i32 0, section ".hsadata_global_agent"
 @external_global_agent = addrspace(1) global i32 0, section ".hsadata_global_agent"
 
 @internal_readonly = internal unnamed_addr addrspace(2) constant i32 0
 @external_readonly = unnamed_addr addrspace(2) constant i32 0
 
 define void @test() {
   ret void
 }
 
+; ASM: .amdgpu_hsa_module_global linkonce_odr_global
+; ASM: .size linkonce_odr_global_program, 4
+; ASM: .hsadata_global_program
+; ASM: linkonce_odr_global_program:
+; ASM: .long 0
+
+; ASM: .amdgpu_hsa_module_global linkonce_global
+; ASM: .size linkonce_global_program, 4
+; ASM: .hsadata_global_program
+; ASM: linkonce_global_program:
+; ASM: .long 0
+
 ; ASM: .amdgpu_hsa_module_global internal_global
 ; ASM: .size internal_global_program, 4
 ; ASM: .hsadata_global_program
 ; ASM: internal_global_program:
 ; ASM: .long 0
 
 ; ASM: .amdgpu_hsa_module_global common_global
 ; ASM: .size common_global_program, 4
 ; ASM: .hsadata_global_program
 ; ASM: common_global_program:
 ; ASM: .long 0
 
 ; ASM: .amdgpu_hsa_program_global external_global
 ; ASM: .size external_global_program, 4
 ; ASM: .hsadata_global_program
 ; ASM: external_global_program:
 ; ASM: .long 0
 
+; ASM: .amdgpu_hsa_module_global linkonce_odr_global
+; ASM: .size linkonce_odr_global_agent, 4
+; ASM: .hsadata_global_agent
+; ASM: linkonce_odr_global_agent:
+; ASM: .long 0
+
+; ASM: .amdgpu_hsa_module_global linkonce_global
+; ASM: .size linkonce_global_agent, 4
+; ASM: .hsadata_global_agent
+; ASM: linkonce_global_agent:
+; ASM: .long 0
+
 ; ASM: .amdgpu_hsa_module_global internal_global
 ; ASM: .size internal_global_agent, 4
 ; ASM: .hsadata_global_agent
 ; ASM: internal_global_agent:
 ; ASM: .long 0
 
 ; ASM: .amdgpu_hsa_module_global common_global
 ; ASM: .size common_global_agent, 4

 ; ELF: Name: internal_readonly
 ; ELF: Size: 4
 ; ELF: Binding: Local
 ; ELF: Type: Object
 ; ELF: Section: .hsatext
 ; ELF: }
 
 ; ELF: Symbol {
+; ELF: Name: linkonce_global_agent
+; ELF: Size: 4
+; ELF: Binding: Local
+; ELF: Section: .hsadata_global_agent
+; ELF: }
+
+; ELF: Symbol {
+; ELF: Name: linkonce_global_program
+; ELF: Size: 4
+; ELF: Binding: Local
+; ELF: Section: .hsadata_global_program
+; ELF: }
+
+; ELF: Symbol {
+; ELF: Name: linkonce_odr_global_agent
+; ELF: Size: 4
+; ELF: Binding: Local
+; ELF: Section: .hsadata_global_agent
+; ELF: }
+
+; ELF: Symbol {
+; ELF: Name: linkonce_odr_global_program
+; ELF: Size: 4
+; ELF: Binding: Local
+; ELF: Section: .hsadata_global_program
+; ELF: }
+
+; ELF: Symbol {
 ; ELF: Name: external_global_agent
 ; ELF: Size: 4
 ; ELF: Binding: Global
 ; ELF: Type: Object
 ; ELF: Section: .hsadata_global_agent
 ; ELF: }
 
 ; ELF: Symbol {