XtensaAsmPrinter: add a missing case for MBB (LLVM-456)

[yamt]

fixes an assertion failure:

Assertion failed: (ACPV->isExtSymbol() && "unrecognized constant pool value"), function emitMachineConstantPoolValue, file XtensaAsmPrinter.cpp, line 110.

observed with wamr-compiler.

[andreisfr]

@yamt. thank you very for investigation of the problem. This problem will be fixed in next release soon.

[yamt]

@yamt. thank you very for investigation of the problem. This problem will be fixed in next release soon.

thank you for taking a look at this.
do you mean the next release which will be based on llvm-20? (just asking)

[gerekon]

@yamt. thank you very for investigation of the problem. This problem will be fixed in next release soon.

thank you for taking a look at this. do you mean the next release which will be based on llvm-20? (just asking)

Yes. It will be based on LLVM 20.1.1

[gerekon]

Fixed on both branches

• xtensa_release_19.1.2 510a078
• release/esp_20.x c2a5eff