Use https rather than http for several URLs.

lib/cretonne/src/regalloc/coalescing.rs

@@ -26,7 +26,7 @@ use timing;
 // The coalescing algorithm implemented follows this paper fairly closely:
 //
 //     Budimlic, Z., Cooper, K. D., Harvey, T. J., et al. (2002). Fast copy coalescing and
-//     live-range identification (Vol. 37, pp. 25–32). ACM. http://doi.org/10.1145/543552.512534
+//     live-range identification (Vol. 37, pp. 25–32). ACM. https://doi.org/10.1145/543552.512534
 //
 // We use a more efficient dominator forest representation (a linear stack) described here:
 //

lib/cretonne/src/result.rs

@@ -26,7 +26,7 @@ pub enum CtonError {
     /// Cretonne can compile very large and complicated functions, but the [implementation has
     /// limits][limits] that cause compilation to fail when they are exceeded.
     ///
-    /// [limits]: http://cretonne.readthedocs.io/en/latest/langref.html#implementation-limits
+    /// [limits]: https://cretonne.readthedocs.io/en/latest/langref.html#implementation-limits
     ImplLimitExceeded,
 
     /// The code size for the function is too large.

lib/filecheck/src/lib.rs

@@ -1,5 +1,5 @@
 //! This crate provides a text pattern matching library with functionality similar to the LLVM
-//! project's [FileCheck command](http://llvm.org/docs/CommandGuide/FileCheck.html).
+//! project's [FileCheck command](https://llvm.org/docs/CommandGuide/FileCheck.html).
 //!
 //! A list of directives is typically extracted from a file containing a test case. The test case
 //! is then run through the program under test, and its output matched against the directives.

lib/wasm/src/func_translator.rs

@@ -45,7 +45,7 @@ impl FuncTranslator {
     ///
     /// See [the WebAssembly specification][wasm].
     ///
-    /// [wasm]: http://webassembly.github.io/spec/binary/modules.html#code-section
+    /// [wasm]: https://webassembly.github.io/spec/binary/modules.html#code-section
     ///
     /// The Cretonne IR function `func` should be completely empty except for the `func.signature`
     /// and `func.name` fields. The signature may contain special-purpose arguments which are not