lock user-mode and semantic-bugs

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+RISC-V Regression: QEMU_CPU=f=false,zfinx=true gives misleading error message
+Description of problem:
+The f extension looks like it should be toggle-able using qemu_cpu since it doesn't throw error messages when specified.
+Disabling the extension using f=false does not actually disable it as shown by the zfinx error message.
+Eg. Unsupported extension is explicitly rejected
+```
+> QEMU_CPU=rv64,j=false ./qemu-riscv64 test.out
+qemu-riscv64: can't apply global rv64-riscv-cpu.j=false: Property 'rv64-riscv-cpu.j' not found
+```
+Steps to reproduce:
+1. Compile any riscv binary like: `int main() {}`
+2. Execute using `QEMU_CPU=rv64,zfinx=true,f=false ./qemu-riscv64 test.out`