Fix unit tests that relied on nontrivial to raw conversion.

Author: atrick

test/SILGen/pointer_conversion.swift

@@ -20,6 +20,7 @@ func takesMutableRawPointer(_ x: UnsafeMutableRawPointer) {}
 func takesConstRawPointer(_ x: UnsafeRawPointer) {}
 func takesOptConstRawPointer(_ x: UnsafeRawPointer?, and: Int) {}
 func takesOptOptConstRawPointer(_ x: UnsafeRawPointer??, and: Int) {}
+func takesMutableFunctionPointer(_ x: UnsafeMutablePointer<() -> Void>) {}
 
 // CHECK-LABEL: sil hidden [ossa] @$s18pointer_conversion0A9ToPointeryySpySiG_SPySiGSvtF
 // CHECK: bb0([[MP:%.*]] : $UnsafeMutablePointer<Int>, [[CP:%.*]] : $UnsafePointer<Int>, [[MRP:%.*]] : $UnsafeMutableRawPointer):
@@ -278,7 +279,7 @@ func functionInoutToPointer() {
 
   // CHECK: [[REABSTRACT_BUF:%.*]] = alloc_stack $@callee_guaranteed @substituted <τ_0_0> () -> @out τ_0_0 for <()>
   // CHECK: address_to_pointer [stack_protection] [[REABSTRACT_BUF]]
-  takesMutableVoidPointer(&f)
+  takesMutableFunctionPointer(&f)
 }
 
 // rdar://problem/31781386

validation-test/stdlib/UnicodeUTFEncoders.swift

@@ -84,14 +84,17 @@ func nsEncode<CodeUnit>(
     length: 4,
     encoding: String.Encoding.utf32LittleEndian.rawValue)!
 
-  s.getBytes(
-    &buffer,
-    maxLength: buffer.count,
-    usedLength: &used,
-    encoding: encoding.rawValue,
-    options: [],
-    range: NSRange(location: 0, length: s.length),
-    remaining: nil)
+  let count = buffer.count
+  _ = buffer.withUnsafeMutableBytes { bufferBytes in
+    s.getBytes(
+      bufferBytes.baseAddress,
+      maxLength: count,
+      usedLength: &used,
+      encoding: encoding.rawValue,
+      options: [],
+      range: NSRange(location: 0, length: s.length),
+      remaining: nil)
+  }
 }
 
 final class CodecTest<Codec : TestableUnicodeCodec> {