[libunwind] Fixed a number of typos

I went over the output of the following mess of a command:

`(ulimit -m 2000000; ulimit -v 2000000; git ls-files -z | parallel --xargs -0 cat | aspell list --mode=none --ignore-case | grep -E '^[A-Za-z][a-z]*$' | sort | uniq -c | sort -n | grep -vE '.{25}' | aspell pipe -W3 | grep : | cut -d' ' -f2 | less)`

and proceeded to spend a few days looking at it to find probable typos
and fixed a few hundred of them in all of the llvm project (note, the
ones I found are not anywhere near all of them, but it seems like a
good start).

Reviewed By: #libunwind, MaskRay

Differential Revision: https://reviews.llvm.org/D130948

NOKEYCHECK=True
GitOrigin-RevId: dad00daa7a0a656640f7579c2c21933ef97a1978
diff --git a/src/libunwind.cpp b/src/libunwind.cpp
index b8b41ff..3f9e051 100644
--- a/src/libunwind.cpp
+++ b/src/libunwind.cpp
@@ -117,7 +117,7 @@
   AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor;
   if (co->validReg(regNum)) {
     co->setReg(regNum, (pint_t)value);
-    // specical case altering IP to re-find info (being called by personality
+    // special case altering IP to re-find info (being called by personality
     // function)
     if (regNum == UNW_REG_IP) {
       unw_proc_info_t info;