RFR: 8259619: C1, x86: 3-arg StubAssembler::call_RT stack-use condition is incorrect

[Aleksey Shipilev]

SonarCould instance reports this code smell in c1_Runtime_x86.cpp: Identical sub-expressions on both sides of operator "||"

int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2, Register arg3) {
#ifdef _LP64
  // if there is any conflict use the stack
  if (arg1 == c_rarg2 || arg1 == c_rarg3 ||
      arg2 == c_rarg1 || arg1 == c_rarg3 ||
      arg3 == c_rarg1 || arg1 == c_rarg2) { <---- HERE
    push(arg3);
    push(arg2);
    push(arg1);
    pop(c_rarg1);
    pop(c_rarg2);
    pop(c_rarg3);
  } else {
    mov(c_rarg1, arg1);
    mov(c_rarg2, arg2);
    mov(c_rarg3, arg3);
  }

It seems obvious that the right column in the condition should have been `arg1`, `arg2`, `arg3`.

Additional testing:
 - [x] Linux x86_64 `tier1`

-------------

Commit messages:
 - 8259619: C1, x86: 3-arg StubAssembler::call_RT stack-use condition is incorrect

Changes: https://git.openjdk.java.net/jdk/pull/2048/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2048&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8259619
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2048.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2048/head:pull/2048

PR: https://git.openjdk.java.net/jdk/pull/2048