sqf: Add optimization to bypass single use vars

[PabstMirror]

Simplify code by bypassing local var storage and gluing commands together

private _pos = getPos player;
_pos vectorAdd offset
// simplify to just
(getPos player) vectorAdd offset

Assumptions:

• _pos can't have any upstream effects because it is private
• nothing below is using _pos
• nothing below can call code that would be using _pos

Test

private _a = diag_tickTime;
x = _a + 5;

private _b = 6;
private _c = _b + 7;

private _d = "test";
_d + "ing"

Original 0.00180925 ms

callNular diag_ticktime;
assignToLocal _a;

getVariable _a;
push 5
callOperator +;
assignTo x;

push 6
assignToLocal _b;

getVariable _b;
push 7
callOperator +;
assignToLocal _c;

push ""test""
assignToLocal _d;

getVariable _d;
push ""ing""
callOperator +;

Optimized 0.0013578 ms

callNular diag_ticktime;
push 5
callOperator +;
assignTo x;

push 6
push 7
callOperator +;
assignToLocal _c;

push ""test""
push ""ing""
callOperator +;

[codecov]

Codecov Report

❌ Patch coverage is 85.00000% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.6%. Comparing base (c61e0c0) to head (2ef9df2).

Files with missing lines	Patch %	Lines
libs/sqf/src/compiler/optimizer/statements.rs	84.8%	18 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
libs/sqf/src/compiler/optimizer/mod.rs	83.7% <100.0%> (ø)
libs/sqf/src/compiler/optimizer/statements.rs	84.8% <84.8%> (ø)

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