Rename llvm::Bool aliases to standard const case

This avoids the need for `#![allow(non_upper_case_globals)]`.

compiler/rustc_codegen_llvm/src/debuginfo/gdb.rs

@@ -72,7 +72,7 @@ pub(crate) fn get_or_insert_gdb_debug_scripts_section_global<'ll>(
                 .unwrap_or_else(|| bug!("symbol `{}` is already defined", section_var_name));
             llvm::set_section(section_var, c".debug_gdb_scripts");
             llvm::set_initializer(section_var, cx.const_bytes(section_contents));
-            llvm::LLVMSetGlobalConstant(section_var, llvm::True);
+            llvm::LLVMSetGlobalConstant(section_var, llvm::TRUE);
             llvm::set_unnamed_address(section_var, llvm::UnnamedAddr::Global);
             llvm::set_linkage(section_var, llvm::Linkage::LinkOnceODRLinkage);
             // This should make sure that the whole section is not larger than

compiler/rustc_codegen_llvm/src/debuginfo/namespace.rs

@@ -38,7 +38,7 @@ pub(crate) fn item_namespace<'ll>(cx: &CodegenCx<'ll, '_>, def_id: DefId) -> &'l
             parent_scope,
             namespace_name_string.as_ptr(),
             namespace_name_string.len(),
-            llvm::False, // ExportSymbols (only relevant for C++ anonymous namespaces)
+            llvm::FALSE, // ExportSymbols (only relevant for C++ anonymous namespaces)
         )
     };