Proposed fix for #15958 that takes the simple approach of allocating a new vector with each invocation of the nlm() callback

git-svn-id: https://svn.r-project.org/R/trunk@66528 00db46b3-68df-0310-9c12-caf00c1e9a41
Avoid duplication in LDCONST and PUSHCONSTARG instructions.


git-svn-id: https://svn.r-project.org/R/trunk@66529 00db46b3-68df-0310-9c12-caf00c1e9a41
Cleanup of BRIFNOT instruction.


git-svn-id: https://svn.r-project.org/R/trunk@66530 00db46b3-68df-0310-9c12-caf00c1e9a41
Clean up SAVE_ALLOC code for arithmetic operations.


git-svn-id: https://svn.r-project.org/R/trunk@66531 00db46b3-68df-0310-9c12-caf00c1e9a41