Improve codegen of new'd structs by not initialising the data twice
Bug 141 - Signed integer overflow handled incorrectly
Bug 142 - ICE, FuncDeclaration::ctfeCompile
Add tests for the last couple bug fixes
Bug 143 - ICE when error message contains embedded format attributes
Fix Bug 146 - ICE in TypeFunction::toCtype
Rebase 4.9.x patches