Fix a case of -Wmisleading-indentation when building with Clang (Ju…

…liaLang#43472)

```
In file included from /usr/home/alex/julia/src/codegen.cpp:2005:
In file included from ./intrinsics.cpp:7:
In file included from ./ccall.cpp:322:
./abi_x86.cpp:78:9: warning: misleading indentation; statement is not part of the previous 'if' [-Wmisleading-indentation]
        ab.addByValAttr(Ty);
        ^
./abi_x86.cpp:73:5: note: previous statement is here
    if (is_complex64(dt) || is_complex128(dt) || (jl_is_primitivetype(dt) && size <= 8))
    ^
1 warning generated.
```

src/abi_x86.cpp

@@ -73,9 +73,9 @@ bool needPassByRef(jl_datatype_t *dt, AttrBuilder &ab, LLVMContext &ctx, Type *T
  if (is_complex64(dt) || is_complex128(dt) || (jl_is_primitivetype(dt) && size <= 8))
  return false;
 #if JL_LLVM_VERSION < 120000
-  ab.addAttribute(Attribute::ByVal);
+ ab.addAttribute(Attribute::ByVal);
 #else
-  ab.addByValAttr(Ty);
+ ab.addByValAttr(Ty);
 #endif
  return true;
 }