Followup on Proposal to move MIR physical register namespace to '$' sigil.

Discussed here:

http://lists.llvm.org/pipermail/llvm-dev/2018-January/120320.html

In preparation for adding support for named vregs we are changing the sigil for
physical registers in MIR to '$' from '%'. This will prevent name clashes of
named physical register with named vregs.

llvm-svn: 323922
diff --git a/llvm/test/CodeGen/AMDGPU/flat-load-clustering.mir b/llvm/test/CodeGen/AMDGPU/flat-load-clustering.mir
index 7154724..c629798 100644
--- a/llvm/test/CodeGen/AMDGPU/flat-load-clustering.mir
+++ b/llvm/test/CodeGen/AMDGPU/flat-load-clustering.mir
@@ -46,32 +46,32 @@
   - { id: 12, class: vreg_64 }
   - { id: 13, class: vreg_64 }
 liveins:
-  - { reg: '%vgpr0', virtual-reg: '%0' }
-  - { reg: '%sgpr4_sgpr5', virtual-reg: '%1' }
+  - { reg: '$vgpr0', virtual-reg: '%0' }
+  - { reg: '$sgpr4_sgpr5', virtual-reg: '%1' }
 body:             |
   bb.0.bb:
-    liveins: %vgpr0, %sgpr4_sgpr5
+    liveins: $vgpr0, $sgpr4_sgpr5
 
-    %1 = COPY %sgpr4_sgpr5
-    %0 = COPY %vgpr0
+    %1 = COPY $sgpr4_sgpr5
+    %0 = COPY $vgpr0
     %3 = S_LOAD_DWORDX2_IMM %1, 0, 0 :: (non-temporal dereferenceable invariant load 8 from `i64 addrspace(2)* undef`)
     %4 = S_LOAD_DWORDX2_IMM %1, 8, 0 :: (non-temporal dereferenceable invariant load 8 from `i64 addrspace(2)* undef`)
-    %7 = V_LSHLREV_B32_e32 2, %0, implicit %exec
-    %2 = V_MOV_B32_e32 0, implicit %exec
-    undef %12.sub0 = V_ADD_I32_e32 %4.sub0, %7, implicit-def %vcc, implicit %exec
+    %7 = V_LSHLREV_B32_e32 2, %0, implicit $exec
+    %2 = V_MOV_B32_e32 0, implicit $exec
+    undef %12.sub0 = V_ADD_I32_e32 %4.sub0, %7, implicit-def $vcc, implicit $exec
     %11 = COPY %4.sub1
-    %12.sub1 = V_ADDC_U32_e32 %11, %2, implicit-def dead %vcc, implicit killed %vcc, implicit %exec
-    %5 = FLAT_LOAD_DWORD %12, 0, 0, 0, implicit %exec, implicit %flat_scr :: (load 4 from %ir.gep1)
-    undef %9.sub0 = V_ADD_I32_e32 %3.sub0, %7, implicit-def %vcc, implicit %exec
+    %12.sub1 = V_ADDC_U32_e32 %11, %2, implicit-def dead $vcc, implicit killed $vcc, implicit $exec
+    %5 = FLAT_LOAD_DWORD %12, 0, 0, 0, implicit $exec, implicit $flat_scr :: (load 4 from %ir.gep1)
+    undef %9.sub0 = V_ADD_I32_e32 %3.sub0, %7, implicit-def $vcc, implicit $exec
     %8 = COPY %3.sub1
-    %9.sub1 = V_ADDC_U32_e32 %8, %2, implicit-def dead %vcc, implicit killed %vcc, implicit %exec
-    undef %13.sub0 = V_ADD_I32_e32 16, %12.sub0, implicit-def %vcc, implicit %exec
-    %13.sub1 = V_ADDC_U32_e32 %12.sub1, %2, implicit-def dead %vcc, implicit killed %vcc, implicit %exec
-    %6 = FLAT_LOAD_DWORD %13, 0, 0, 0, implicit %exec, implicit %flat_scr :: (load 4 from %ir.gep34)
-    undef %10.sub0 = V_ADD_I32_e32 16, %9.sub0, implicit-def %vcc, implicit %exec
-    %10.sub1 = V_ADDC_U32_e32 %9.sub1, %2, implicit-def dead %vcc, implicit killed %vcc, implicit %exec
-    FLAT_STORE_DWORD %9, %5, 0, 0, 0, implicit %exec, implicit %flat_scr :: (store 4 into %ir.gep2)
-    FLAT_STORE_DWORD %10, %6, 0, 0, 0, implicit %exec, implicit %flat_scr :: (store 4 into %ir.gep4)
+    %9.sub1 = V_ADDC_U32_e32 %8, %2, implicit-def dead $vcc, implicit killed $vcc, implicit $exec
+    undef %13.sub0 = V_ADD_I32_e32 16, %12.sub0, implicit-def $vcc, implicit $exec
+    %13.sub1 = V_ADDC_U32_e32 %12.sub1, %2, implicit-def dead $vcc, implicit killed $vcc, implicit $exec
+    %6 = FLAT_LOAD_DWORD %13, 0, 0, 0, implicit $exec, implicit $flat_scr :: (load 4 from %ir.gep34)
+    undef %10.sub0 = V_ADD_I32_e32 16, %9.sub0, implicit-def $vcc, implicit $exec
+    %10.sub1 = V_ADDC_U32_e32 %9.sub1, %2, implicit-def dead $vcc, implicit killed $vcc, implicit $exec
+    FLAT_STORE_DWORD %9, %5, 0, 0, 0, implicit $exec, implicit $flat_scr :: (store 4 into %ir.gep2)
+    FLAT_STORE_DWORD %10, %6, 0, 0, 0, implicit $exec, implicit $flat_scr :: (store 4 into %ir.gep4)
     S_ENDPGM
 
 ...