Erik Eckstein 56ecb8fc9b Enable better runtime failure messages ...

The implementation was done quite a while ago.
Now, that we have support in lldb (https://github.com/apple/llvm-project/pull/773), we can enable it by default in the compiler.

LLDB now shows the runtime failure reason, for example:

* thread #1, queue = 'com.apple.main-thread', stop reason = Swift runtime failure: arithmetic overflow
    frame #1: 0x0000000100000f0d a.out`testit(a=127) at trap_message.swift:4
   1
   2   	@inline(never)
   3   	func testit(_ a: Int8) -> Int8 {
-> 4   	  return a + 1
   5   	}
   6

For details, see https://github.com/apple/swift/pull/25978

rdar://problem/51278690

2020-02-18 12:03:57 +01:00

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