Update to regalloc.rs 0.0.28.

This version of regalloc.rs includes several bugfixes for
reference-types support used by the new backend framework and the
aarch64 backend (bytecodealliance/regalloc.rs#85 and
bytecodealliance/regalloc.rs#86).

Cargo.lock

@@ -1680,9 +1680,9 @@ dependencies = [
 
 [[package]]
 name = "regalloc"
-version = "0.0.27"
+version = "0.0.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b9ba8aaf5fe7cf307c6dbdaeed85478961d29e25e3bee5169e11b92fa9f027a8"
+checksum = "3598bed0895fe0f72a9e0b00ef9e3a3c8af978a8401b2f2046dec5927de6364a"
 dependencies = [
  "log",
  "rustc-hash",

cranelift/codegen/Cargo.toml

@@ -26,7 +26,7 @@ smallvec = { version = "1.0.0" }
 thiserror = "1.0.4"
 byteorder = { version = "1.3.2", default-features = false }
 peepmatic-runtime = { path = "../peepmatic/crates/runtime", optional = true, version = "0.2.0" }
-regalloc = { version = "0.0.27" }
+regalloc = { version = "0.0.28" }
 # It is a goal of the cranelift-codegen crate to have minimal external dependencies.
 # Please don't add any unless they are essential to the task of creating binary
 # machine code. Integration tests that need external dependencies can be

cranelift/filetests/filetests/vcode/aarch64/reftypes.clif

@@ -84,12 +84,13 @@ block3(v7: r64, v8: r64):
 ; nextln: mov x20, x1
 ; nextln: mov x0, x19
 ; nextln: ldr x16, 8 ; b 12 ; data
-; nextln: stur x19, [sp, #24]
-; nextln: stur x20, [sp, #32]
-; nextln: (safepoint: slots [S0, S1]
+; nextln: stur x0, [sp, #24]
+; nextln: stur x19, [sp, #32]
+; nextln: stur x20, [sp, #40]
+; nextln: (safepoint: slots [S0, S1, S2]
 ; nextln: blr x16
-; nextln: ldur x19, [sp, #24]
-; nextln: ldur x20, [sp, #32]
+; nextln: ldur x19, [sp, #32]
+; nextln: ldur x20, [sp, #40]
 ; nextln: add x1, sp, #16
 ; nextln: stur x19, [x1]
 ; nextln: and w0, w0, #1