[Modules] Fix modular build. (#122034)

Add a new file to the module map and remove 2 missing files (migrated
from .def to .td).

Author: vsapsai

clang/include/module.modulemap

@@ -62,8 +62,6 @@ module Clang_Basic {
   textual header "clang/Basic/BuiltinsVE.def"
   textual header "clang/Basic/BuiltinsVEVL.gen.def"
   textual header "clang/Basic/BuiltinsWebAssembly.def"
-  textual header "clang/Basic/BuiltinsX86.def"
-  textual header "clang/Basic/BuiltinsX86_64.def"
   textual header "clang/Basic/BuiltinsXCore.def"
   textual header "clang/Basic/CFProtectionOptions.def"
   textual header "clang/Basic/CodeGenOptions.def"

llvm/include/module.modulemap

@@ -96,6 +96,7 @@ module LLVM_BinaryFormat {
     textual header "llvm/BinaryFormat/ELFRelocs/PowerPC64.def"
     textual header "llvm/BinaryFormat/ELFRelocs/PowerPC.def"
     textual header "llvm/BinaryFormat/ELFRelocs/RISCV.def"
+    textual header "llvm/BinaryFormat/ELFRelocs/RISCV_nonstandard.def"
     textual header "llvm/BinaryFormat/ELFRelocs/Sparc.def"
     textual header "llvm/BinaryFormat/ELFRelocs/SystemZ.def"
     textual header "llvm/BinaryFormat/ELFRelocs/VE.def"