CI: Add test case for disabling EXT_M with JIT enabled

Add a new test case to the CI pipeline to verify JIT functionality when
the EXT_M extension is disabled. This ensures better coverage and
prevents regressions for this specific configuration.

Author: eleanorLYJ

.github/workflows/main.yml

@@ -106,6 +106,7 @@ jobs:
             make ENABLE_JIT=1 clean && make ENABLE_EXT_A=0 ENABLE_JIT=1 check -j$(nproc)
             make ENABLE_JIT=1 clean && make ENABLE_EXT_F=0 ENABLE_JIT=1 check -j$(nproc)
             make ENABLE_JIT=1 clean && make ENABLE_EXT_C=0 ENABLE_JIT=1 check -j$(nproc)
+            make ENABLE_JIT=1 clean && make ENABLE_EXT_M=0 ENABLE_JIT=1 check -j$(nproc)
             make ENABLE_JIT=1 clean && make ENABLE_Zba=0 ENABLE_JIT=1 check -j$(nproc)
             make ENABLE_JIT=1 clean && make ENABLE_Zbb=0 ENABLE_JIT=1 check -j$(nproc)
             make ENABLE_JIT=1 clean && make ENABLE_Zbc=0 ENABLE_JIT=1 check -j$(nproc)