[SR-7504] Too complex expression involving single UInt64 variable

[krzyzanowskim]

Previous ID	SR-7504
Radar	None
Original Reporter	@krzyzanowskim
Type	Bug

Attachment: Download

Environment

Version 9.3 (9E145), Swift 4.1

Apple Swift version 4.1 (swiftlang-902.0.48 clang-902.0.37.1)
Target: x86_64-apple-darwin17.5.0

Additional Detail from JIRA

Votes	0
Component/s	Compiler
Labels	Bug, 4.1Regression, TypeChecker
Assignee	None
Priority	Medium

md5: 7353c2a1a5bb2c072e1887e653bdb177

Issue Description:

This fairly simple calculation is too complex to be solved in Swift 4.1. This is rather a regression as it worked in Swift 4.0

where x is UInt64

var x: UInt64 = ((x >> (6 * 1)) & 0xFF) << (8 * 0) | // Expression was too complex to be solved in reasonable time; consider breaking up the expression into distinct sub-expressions
        ((x >> (6 * 3)) & 0xFF) << (8 * 1)
return x

[AnnaZaks]

cc @rudkx