[wpe-2.46][ARMv7] JSC build fail with Clang 20 and later

[emutavchi]

Build fails while compiling generated LLIntAssembly.h with an error 'Relocation Not In Range'

<inline asm>:320:49: error: Relocation Not In Range
  320 | movw r4, #:lower16:.Lllint_op_tail_call_varargs - .Lllint_relativePCBase 
      |                                                 ^
<inline asm>:321:49: error: Relocation Not In Range
  321 | movt r4, #:upper16:.Lllint_op_tail_call_varargs - .Lllint_relativePCBase 
...

which may be related to llvm/llvm-project@a4d6fe5 and mvlbl implementation for ARMv7 (see setEntryAddressCommon in LowLevelInterpreter.asm)

To reproduce the JSC build error, you'll also need some build fixes backported from upstream for WTF, see attached

wtf_clang_20.patch