Always use extern crate std in cranelift-codegen

cranelift/codegen/src/legalizer/boundary.rs

@@ -28,7 +28,7 @@ use crate::ir::{
 use crate::isa::TargetIsa;
 use crate::legalizer::split::{isplit, vsplit};
 use log::debug;
-use std::vec::Vec;
+use alloc::vec::Vec;
 
 /// Legalize all the function signatures in `func`.
 ///

cranelift/codegen/src/legalizer/libcall.rs

@@ -4,7 +4,7 @@ use crate::ir;
 use crate::ir::{get_libcall_funcref, InstBuilder};
 use crate::isa::{CallConv, TargetIsa};
 use crate::legalizer::boundary::legalize_libcall_signature;
-use std::vec::Vec;
+use alloc::vec::Vec;
 
 /// Try to expand `inst` as a library call, returning true is successful.
 pub fn expand_as_libcall(inst: ir::Inst, func: &mut ir::Function, isa: &dyn TargetIsa) -> bool {

cranelift/codegen/src/legalizer/mod.rs

@@ -21,8 +21,8 @@ use crate::ir::{self, InstBuilder, MemFlags};
 use crate::isa::TargetIsa;
 use crate::predicates;
 use crate::timing;
-use std::collections::BTreeSet;
-use std::vec::Vec;
+use alloc::collections::BTreeSet;
+use alloc::vec::Vec;
 
 mod boundary;
 mod call;
@@ -373,7 +373,7 @@ fn expand_br_table_conds(
     let table_size = func.jump_tables[table].len();
     let mut cond_failed_ebb = vec![];
     if table_size >= 1 {
-        cond_failed_ebb = std::vec::Vec::with_capacity(table_size - 1);
+        cond_failed_ebb = alloc::vec::Vec::with_capacity(table_size - 1);
         for _ in 0..table_size - 1 {
             cond_failed_ebb.push(func.dfg.make_ebb());
         }

cranelift/codegen/src/legalizer/split.rs

@@ -69,7 +69,7 @@ use crate::flowgraph::{BasicBlock, ControlFlowGraph};
 use crate::ir::{self, Ebb, Inst, InstBuilder, InstructionData, Opcode, Type, Value, ValueDef};
 use core::iter;
 use smallvec::SmallVec;
-use std::vec::Vec;
+use alloc::vec::Vec;
 
 /// Split `value` into two values using the `isplit` semantics. Do this by reusing existing values
 /// if possible.