- Use edx for CALLs instead of ecx, as the latter does not require any push to stack
- Make Linux AT&T asm code consistent with the MASM codeblock

(cherry picked from commit 3f9ec83ce07e7ce078662c41b177d2247da77758)
Use scaled indexing mode n=4 for addressing opStack, this way we can use the 8 bit offset value in %%bl to address an OPSTACK_SIZE of 1024 which was the old value.

(cherry picked from commit 61d6e6eb68741fec254081fe765c550826ce04f7)
Fix VM call for release version, bug introduced by myself in r1994

(cherry picked from commit a42239e1e50b6d019702bb5119fb1b49cacfd9fc)
I don't seem to get these constraints right. This should fix it

(cherry picked from commit b8ef880d85b00dc9cf6ec1a4a0711b7b0912a80f)