AMDGPU: Fix Section relative fixups

[jvesely]

Summary

These are used by R600.
Fixes regressions since r279895.

[jvesely]

update test

[jvesely]

superseded by D23994

lib/Target/AMDGPU/MCTargetDesc/AMDGPUAsmBackend.cpp

case AMDGPU::fixup_si_sopp_br: {
 
     return BrImm;
   }
   case FK_Data_1:
   case FK_Data_2:
   case FK_Data_4:
   case FK_Data_8:
   case FK_PCRel_4:
+  case FK_SecRel_4:
     return Value;
   default:
     llvm_unreachable("unhandled fixup kind");
   }
 }
 
 void AMDGPUAsmBackend::processFixupValue(const MCAssembler &Asm,
                                          const MCAsmLayout &Layout,

test/CodeGen/AMDGPU/gv-const-addrspace.ll

 ; RUN: llc -march=amdgcn -mcpu=SI -verify-machineinstrs < %s | FileCheck -check-prefix=SI -check-prefix=GCN -check-prefix=FUNC %s
 ; RUN: llc -march=amdgcn -mcpu=tonga -verify-machineinstrs < %s | FileCheck -check-prefix=VI -check-prefix=GCN -check-prefix=FUNC %s
 ; RUN: llc -march=r600 -mcpu=redwood < %s | FileCheck -check-prefix=EG -check-prefix=FUNC %s
 ; RUN: llc -march=r600 -mcpu=cayman < %s | FileCheck -check-prefix=EG -check-prefix=FUNC %s
+; RUN: llc -march=r600 -mcpu=cypress -filetype=obj < %s | llvm-readobj -relocations -symbols | FileCheck %s -check-prefix=EG-OBJ
 
 
 @b = internal addrspace(2) constant [1 x i16] [ i16 7 ], align 2
+; EG-OBJ-DAG: Name: b
 
 @float_gv = internal unnamed_addr addrspace(2) constant [5 x float] [float 0.0, float 1.0, float 2.0, float 3.0, float 4.0], align 4
+; EG-OBJ-DAG: Name: float_gv
 
 ; FUNC-LABEL: {{^}}float:
 ; GCN: s_load_dword
 
 ; EG: VTX_READ_32
 ; EG: @float_gv
 ; EG-NOT: MOVA_INT
 ; EG-NOT: MOV
 define void @float(float addrspace(1)* %out, i32 %index) {
 entry:
   %0 = getelementptr inbounds [5 x float], [5 x float] addrspace(2)* @float_gv, i32 0, i32 %index
   %1 = load float, float addrspace(2)* %0
   store float %1, float addrspace(1)* %out
   ret void
 }
 
 @i32_gv = internal unnamed_addr addrspace(2) constant [5 x i32] [i32 0, i32 1, i32 2, i32 3, i32 4], align 4
+; EG-OBJ-DAG: Name: i32_gv
 
 ; FUNC-LABEL: {{^}}i32:
 
 ; GCN: s_load_dword
 
 ; EG: VTX_READ_32
 ; EG: @i32_gv
 ; EG-NOT: MOVA_INT
 ; EG-NOT: MOV
 define void @i32(i32 addrspace(1)* %out, i32 %index) {
 entry:
   %0 = getelementptr inbounds [5 x i32], [5 x i32] addrspace(2)* @i32_gv, i32 0, i32 %index
   %1 = load i32, i32 addrspace(2)* %0
   store i32 %1, i32 addrspace(1)* %out
   ret void
 }
 
 
 %struct.foo = type { float, [5 x i32] }
 
 @struct_foo_gv = internal unnamed_addr addrspace(2) constant [1 x %struct.foo] [ %struct.foo { float 16.0, [5 x i32] [i32 0, i32 1, i32 2, i32 3, i32 4] } ]
+; EG-OBJ-DAG: Name: struct_foo_gv
 
 ; FUNC-LABEL: {{^}}struct_foo_gv_load:
 ; GCN: s_load_dword
 
 ; EG: VTX_READ_32
 ; EG: @struct_foo_gv
 ; EG-NOT: MOVA_INT
 ; EG-NOT: MOV
 define void @struct_foo_gv_load(i32 addrspace(1)* %out, i32 %index) {
   %gep = getelementptr inbounds [1 x %struct.foo], [1 x %struct.foo] addrspace(2)* @struct_foo_gv, i32 0, i32 0, i32 1, i32 %index
   %load = load i32, i32 addrspace(2)* %gep, align 4
   store i32 %load, i32 addrspace(1)* %out, align 4
   ret void
 }
 
 @array_v1_gv = internal addrspace(2) constant [4 x <1 x i32>] [ <1 x i32> <i32 1>,
                                                                 <1 x i32> <i32 2>,
                                                                 <1 x i32> <i32 3>,
                                                                 <1 x i32> <i32 4> ]
+; EG-OBJ-DAG: Name: array_v1_gv_load
 
 ; FUNC-LABEL: {{^}}array_v1_gv_load:
 ; GCN: s_load_dword
 
 ; EG: VTX_READ_32
 ; EG: @array_v1_gv
 ; EG-NOT: MOVA_INT
 ; EG-NOT: MOV