[gardening] Fix comments not starting with "// " or "# "

Author: practicalswift

benchmark/single-source/Walsh.swift

@@ -15,7 +15,7 @@ import Darwin
 
 func IsPowerOfTwo(_ x: Int) -> Bool { return (x & (x - 1)) == 0 }
 
-//Fast Walsh Hadamard Transform
+// Fast Walsh Hadamard Transform
 func WalshTransform(_ data: inout [Double]) {
   assert(IsPowerOfTwo(data.count), "Not a power of two")
   var temp = [Double](repeating: 0, count: data.count)

test/Parse/invalid.swift

@@ -67,7 +67,7 @@ func g573() { f573(Starfish(), Salmon()) }
 func SR698(_ a: Int, b: Int) {}
 SR698(1, b: 2,) // expected-error {{unexpected ',' separator}}
 
-//SR-979 - Two inout crash compiler
+// SR-979 - Two inout crash compiler
 func SR979a(a : inout inout Int) {}  // expected-error {{parameter may not have multiple 'inout', 'var', or 'let' specifiers}} {{17-23=}}
 func SR979b(inout inout b: Int) {}  // expected-error {{parameter may not have multiple 'inout', 'var', or 'let' specifiers}} {{19-25=}}
 // expected-error @-1 {{'inout' before a parameter name is not allowed, place it before the parameter type instead}} {{13-18=}} {{28-28=inout }}

test/SILOptimizer/specialize_ext.swift

@@ -17,5 +17,5 @@ public func exp1() {
   var J = XXX<Int>(t: 4)
   J.bar(3)
 }
-//Make sure that we are able to specialize the extension 'bar'
+// Make sure that we are able to specialize the extension 'bar'
 //CHECK: sil shared [noinline] @_TTSg5Si___TFV14specialize_ext3XXX3bar