all: format code according to Go 1.19 rules

Go 1.19 started reformatting code in a way that makes it more obvious
how it will be rendered on pkg.go.dev. It gets it almost right, but not
entirely. Therefore, I had to modify some of the comments so that they
are formatted correctly.

compiler/testdata/pragma.go

@@ -3,44 +3,53 @@ package main
 import _ "unsafe"
 
 // Creates an external global with name extern_global.
+//
 //go:extern extern_global
 var externGlobal [0]byte
 
 // Creates a
+//
 //go:align 32
 var alignedGlobal [4]uint32
 
 // Test conflicting pragmas (the last one counts).
+//
 //go:align 64
 //go:align 16
 var alignedGlobal16 [4]uint32
 
 // Test exported functions.
+//
 //export extern_func
 func externFunc() {
 }
 
 // Define a function in a different package using go:linkname.
+//
 //go:linkname withLinkageName1 somepkg.someFunction1
 func withLinkageName1() {
 }
 
 // Import a function from a different package using go:linkname.
+//
 //go:linkname withLinkageName2 somepkg.someFunction2
 func withLinkageName2()
 
 // Function has an 'inline hint', similar to the inline keyword in C.
+//
 //go:inline
 func inlineFunc() {
 }
 
 // Function should never be inlined, equivalent to GCC
 // __attribute__((noinline)).
+//
 //go:noinline
 func noinlineFunc() {
 }
 
 // This function should have the specified section.
+//
 //go:section .special_function_section
 func functionInSection() {
 }
@@ -51,6 +60,7 @@ func exportedFunctionInSection() {
 }
 
 // This function should not: it's only a declaration and not a definition.
+//
 //go:section .special_function_section
 func undefinedFunctionNotInSection()