Remove deprecated LLVM-style inline assembly

Author: tmiasko

src/asm.rs

@@ -4,7 +4,6 @@ use rustc_codegen_ssa::mir::operand::OperandValue;
 use rustc_codegen_ssa::mir::place::PlaceRef;
 use rustc_codegen_ssa::traits::{AsmBuilderMethods, AsmMethods, BaseTypeMethods, BuilderMethods, GlobalAsmOperandRef, InlineAsmOperandRef};
 
-use rustc_hir::LlvmInlineAsmInner;
 use rustc_middle::{bug, ty::Instance};
 use rustc_span::{Span, Symbol};
 use rustc_target::asm::*;
@@ -106,17 +105,6 @@ enum ConstraintOrRegister {
 
 
 impl<'a, 'gcc, 'tcx> AsmBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
-    fn codegen_llvm_inline_asm(&mut self, _ia: &LlvmInlineAsmInner, _outputs: Vec<PlaceRef<'tcx, RValue<'gcc>>>, _inputs: Vec<RValue<'gcc>>, span: Span) -> bool {
-        self.sess().struct_span_err(span, "GCC backend does not support `llvm_asm!`")
-            .help("consider using the `asm!` macro instead")
-            .emit();
-
-        // We return `true` even if we've failed to generate the asm
-        // because we want to suppress the "malformed inline assembly" error
-        // generated by the frontend.
-        true
-    }
-
     fn codegen_inline_asm(&mut self, template: &[InlineAsmTemplatePiece], rust_operands: &[InlineAsmOperandRef<'tcx, Self>], options: InlineAsmOptions, span: &[Span], _instance: Instance<'_>, _dest_catch_funclet: Option<(Self::BasicBlock, Self::BasicBlock, Option<&Self::Funclet>)>) {
         if options.contains(InlineAsmOptions::MAY_UNWIND) {
             self.sess()