[WebAssembly] Change catch_all's opcode

[aheejin]

Summary

We decided to change catch_all's opcode from 0x05, which is the same
as else, to 0x19, to avoid some complicated handling in the tools.

See: https://github.com/WebAssembly/exception-handling/issues/147

[sbc100]

Is there no test that includes this encoding?

[aheejin]

We don't have any specific file to test encoding for EH in test/MC/WebAssembly. To be more precisely, we only have that for SIMD and not for all other instructions. Do you want me to add one?

[sbc100]

No thats fine. I was just making sure we wouldn't break an existing test..

llvm/lib/Target/WebAssembly/WebAssemblyInstrControl.td

 // Currently 'catch' can only extract an i32, which is sufficient for C++
 // support, but according to the spec 'catch' can extract any number of values
 // based on the event type.
 defm CATCH : I<(outs I32:$dst), (ins event_op:$tag),
                (outs), (ins event_op:$tag),
                [(set I32:$dst,
                  (WebAssemblycatch (WebAssemblywrapper texternalsym:$tag)))],
                "catch   \t$dst, $tag", "catch   \t$tag", 0x07>;
-defm CATCH_ALL : NRI<(outs), (ins), [], "catch_all", 0x05>;
+defm CATCH_ALL : NRI<(outs), (ins), [], "catch_all", 0x19>;
 }
 
 // Delegating an exception: delegate
 let isTerminator = 1, hasCtrlDep = 1, hasSideEffects = 1 in
 defm DELEGATE : NRI<(outs), (ins bb_op:$dst), [], "delegate \t $dst", 0x18>;
 
 // Pseudo instructions: cleanupret / catchret
 let isTerminator = 1, hasSideEffects = 1, isBarrier = 1, hasCtrlDep = 1,
     isPseudo = 1, isEHScopeReturn = 1 in {
   defm CLEANUPRET : NRI<(outs), (ins), [(cleanupret)], "cleanupret", 0>;
   defm CATCHRET : NRI<(outs), (ins bb_op:$dst, bb_op:$from),
                       [(catchret bb:$dst, bb:$from)], "catchret", 0>;
 } // isTerminator = 1, hasSideEffects = 1, isBarrier = 1, hasCtrlDep = 1,
   // isPseudo = 1, isEHScopeReturn = 1
 } // Predicates = [HasExceptionHandling]