Rollup merge of #133952 - bjorn3:remove_wasm_legacy_abi, r=alexcrichton

Remove wasm legacy abi

Closes rust-lang/rust#122532
Closes rust-lang/rust#138762
Fixes rust-lang/rust#71871
rust-lang/rust#88152
Fixes rust-lang/rust#115666
Fixes rust-lang/rust#129486

Author: fmease

src/builder.rs

@@ -30,7 +30,7 @@ use rustc_middle::ty::{self, AtomicOrdering, Instance, Ty, TyCtxt};
 use rustc_span::Span;
 use rustc_span::def_id::DefId;
 use rustc_target::callconv::FnAbi;
-use rustc_target::spec::{HasTargetSpec, HasWasmCAbiOpt, HasX86AbiOpt, Target, WasmCAbi, X86Abi};
+use rustc_target::spec::{HasTargetSpec, HasX86AbiOpt, Target, X86Abi};
 
 use crate::common::{SignType, TypeReflection, type_is_pointer};
 use crate::context::CodegenCx;
@@ -2394,12 +2394,6 @@ impl<'tcx> HasTargetSpec for Builder<'_, '_, 'tcx> {
     }
 }
 
-impl<'tcx> HasWasmCAbiOpt for Builder<'_, '_, 'tcx> {
-    fn wasm_c_abi_opt(&self) -> WasmCAbi {
-        self.cx.wasm_c_abi_opt()
-    }
-}
-
 impl<'tcx> HasX86AbiOpt for Builder<'_, '_, 'tcx> {
     fn x86_abi_opt(&self) -> X86Abi {
         self.cx.x86_abi_opt()

src/context.rs

@@ -19,9 +19,7 @@ use rustc_middle::ty::{self, ExistentialTraitRef, Instance, Ty, TyCtxt};
 use rustc_session::Session;
 use rustc_span::source_map::respan;
 use rustc_span::{DUMMY_SP, Span};
-use rustc_target::spec::{
-    HasTargetSpec, HasWasmCAbiOpt, HasX86AbiOpt, Target, TlsModel, WasmCAbi, X86Abi,
-};
+use rustc_target::spec::{HasTargetSpec, HasX86AbiOpt, Target, TlsModel, X86Abi};
 
 #[cfg(feature = "master")]
 use crate::abi::conv_to_fn_attribute;
@@ -512,12 +510,6 @@ impl<'gcc, 'tcx> HasTargetSpec for CodegenCx<'gcc, 'tcx> {
     }
 }
 
-impl<'gcc, 'tcx> HasWasmCAbiOpt for CodegenCx<'gcc, 'tcx> {
-    fn wasm_c_abi_opt(&self) -> WasmCAbi {
-        self.tcx.sess.opts.unstable_opts.wasm_c_abi
-    }
-}
-
 impl<'gcc, 'tcx> HasX86AbiOpt for CodegenCx<'gcc, 'tcx> {
     fn x86_abi_opt(&self) -> X86Abi {
         X86Abi {