[ARMv7] Fix clang20 build

https://bugs.webkit.org/show_bug.cgi?id=306182

Reviewed by Yusuke Suzuki.

See #1600.

We fix this build error:
```
<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
...

by emiting a worse sequence, a jump + data + a pc-relative load. This is
only emitted at startup, so the perf impact should be minimal.

* Source/JavaScriptCore/offlineasm/arm.rb:

Canonical link: https://commits.webkit.org/306181@main

Author: justinmichaud

Source/JavaScriptCore/offlineasm/arm.rb

@@ -755,8 +755,14 @@ def lowerARMCommon
             armMoveImmediate(operands[0].value >> 32, operands[1])
             armMoveImmediate(operands[0].value & 0xffffffff, operands[2])
         when "mvlbl"
-                $asm.puts "movw #{operands[1].armOperand}, \#:lower16:#{operands[0].value}"
-                $asm.puts "movt #{operands[1].armOperand}, \#:upper16:#{operands[0].value}"
+            afterData = LocalLabel.unique(codeOrigin, "mvlbl")
+            data = LocalLabel.unique(codeOrigin, "mvlbl")
+            $asm.puts "b #{LocalLabelReference.new(codeOrigin, afterData).asmLabel}"
+            $asm.puts ".align 1"
+            data.lower("ARM")
+            $asm.puts ".word #{operands[0].value}"
+            afterData.lower("ARM")
+            $asm.puts "ldr #{operands[1].armOperand}, #{LocalLabelReference.new(codeOrigin, data).asmLabel}"
         when "sxb2i"
             $asm.puts "sxtb #{armFlippedOperands(operands)}"
         when "sxh2i"
@@ -1000,4 +1006,3 @@ def lowerARMCommon
         end
     end
 end
-