A bug in multipass JIT mode

[erxiaozhou]

Bug Report

1. Minimal reproduce step (Required)

1. Compile the WAT code to WASM and use the multipass JIT + debug mode to execute the function "to_test"

(module
  (type (;0;) (func (param i32) (result i64)))
  (type (;1;) (func (result i64)))
  (func (;0;) (type 1) (result i64)
    (local i32)
    i32.const -1812402867
    memory.grow
    local.get 0
    local.set 0
    local.tee 0
    drop
    local.get 0
    i64.load32_u offset=55218920 align=1)
  (memory (;0;) 1)
  (export "to_test" (func 0)))

2. What did you expect to see? (Required)

No crash.

3. What did you see instead (Required)

There is a crash.

dtvm: xxxxx/DTVM_TO_REPORT/src/compiler/cgir/pass/register_coalescer.cpp:2749: bool COMPILER::JoinVals::resolveConflicts(COMPILER::JoinVals&): Assertion `!TaintExtent.empty() && "There should be at least one conflict."' failed.
Aborted (core dumped)

4. What is the version of this project you are using? (Required)

f855267