[GlobalISel] Regex the opcodes in unit test to fix non-deterministic ordering

[mgrang]

legalize-ext-csedebug-output.mir fails in a reverse iteration build because the OpcodeHitTable is a DenseMap and is iterated to print CSEInfo. We could have copied OpcodeHitTable to a vector and sorted it before iteration. Maybe that would be an overkill. I saw this comment in the test that we could regex the opcodes. Do we care about the order of the CSEInfo opcodes?

[aditya_nandakumar]

In D57988#1391452, @mgrang wrote:

legalize-ext-csedebug-output.mir fails in a reverse iteration build because the OpcodeHitTable is a DenseMap and is iterated to print CSEInfo. We could have copied OpcodeHitTable to a vector and sorted it before iteration. Maybe that would be an overkill. I saw this comment in the test that we could regex the opcodes. Do we care about the order of the CSEInfo opcodes?

Sorry this test is brittle. This change should have been done in the first place as there were a couple of build failures already. Thanks.

[mgrang]

Committed in r353652.

test/CodeGen/AArch64/GlobalISel/legalize-ext-csedebug-output.mir

bb.0.entry:
     ; CHECK: CSEInfo::Recording new MI G_CONSTANT
     ; CHECK: CSEInfo::Recording new MI G_TRUNC
     ; CHECK: CSEInfo::Recording new MI G_TRUNC
     ; CHECK: CSEInfo::Recording new MI G_AND
     ; CHECK: CSEInfo::Recording new MI G_AND
     ; CHECK: CSEInfo::Found Instr %{{[0-9]+}}:_(s32) = G_CONSTANT
     ; CHECK: CSEInfo::Found Instr %{{[0-9]+}}:_(s32) = G_TRUNC
     ; CHECK: CSEInfo::Found Instr %{{[0-9]+}}:_(s32) = G_AND
-    ; Note - these will be sensitive the opcode numbers. If
-    ; frequently modifying generic opcodes, we could just regex
-    ; the opcodes in the following lines instead of checking for
-    ; specific opcode numbers.
-    ; CHECK: CSEInfo::CSE Hit for Opc 82 : 1
-    ; CHECK: CSEInfo::CSE Hit for Opc 41 : 1
-    ; CHECK: CSEInfo::CSE Hit for Opc 83 : 1
+    ; CHECK: CSEInfo::CSE Hit for Opc {{[0-9]+}} : 1
+    ; CHECK: CSEInfo::CSE Hit for Opc {{[0-9]+}} : 1
+    ; CHECK: CSEInfo::CSE Hit for Opc {{[0-9]+}} : 1
     %0:_(s64) = COPY $x0
     %1:_(s8) = G_TRUNC %0(s64)
     %19:_(s32) = G_ZEXT %1(s8)
     $w0 = COPY %19(s32)
     %2:_(s8) = G_TRUNC %0(s64)
     %20:_(s32) = G_ZEXT %2(s8)
     $w0 = COPY %20(s32)