Adjust documentation for git migration.

This fixes most references to the paths:
 llvm.org/svn/
 llvm.org/git/
 llvm.org/viewvc/
 github.com/llvm-mirror/
 github.com/llvm-project/
 reviews.llvm.org/diffusion/

to instead point to https://github.com/llvm/llvm-project.

This is *not* a trivial substitution, because additionally, all the
checkout instructions had to be migrated to instruct users on how to
use the monorepo layout, setting LLVM_ENABLE_PROJECTS instead of
checking out various projects into various subdirectories.

I've attempted to not change any scripts here, only documentation. The
scripts will have to be addressed separately.

Additionally, I've deleted one document which appeared to be outdated
and unneeded:
  lldb/docs/building-with-debug-llvm.txt

Differential Revision: https://reviews.llvm.org/D57330

git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@352514 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/www/index.html b/www/index.html
index d8a2571..91a92ac 100644
--- a/www/index.html
+++ b/www/index.html
@@ -25,8 +25,7 @@
     <a href="http://lists.llvm.org/mailman/listinfo/openmp-dev">openmp-dev</a>
     <a href="http://lists.llvm.org/mailman/listinfo/openmp-commits">openmp-commits</a>
     <a href="http://llvm.org/bugs/">Bug Reports</a>
-    <a href="http://llvm.org/svn/llvm-project/openmp/trunk/">Browse SVN</a>
-    <a href="http://llvm.org/viewvc/llvm-project/openmp/trunk/">Browse ViewVC</a>
+    <a href="https://github.com/llvm/llvm-project/openmp">Browse Sources</a>
   </div>
 </div>
 
@@ -154,30 +153,22 @@
   <p>To check out the code, use:</p>
 
   <ul>
-  <li><code>svn co http://llvm.org/svn/llvm-project/openmp/trunk openmp</code></li>
+  <li><code>git clone https://github.com/llvm/llvm-project.git</code></li>
   </ul>
 
-  <p>
-     Note that for an in-tree build, you should check out openmp to llvm/projects.
-  </p>
-
   <p>In-tree build:</p>
   <ul>
-    <li><code>cd where-you-want-to-live</code></li>
-    <li>Check out openmp into llvm/projects</li>
-    <li><code>cd where-you-want-to-build</code></li>
+    <li><code>cd llvm-project</code></li>
     <li><code>mkdir build &amp;&amp; cd build</code></li>
-    <li><code>cmake path/to/llvm -DCMAKE_C_COMPILER=&lt;C compiler&gt; -DCMAKE_CXX_COMPILER=&lt;C++ compiler&gt;</code></li>
+    <li><code>cmake ../llvm -DLLVM_ENABLE_PROJECTS=openmp -DCMAKE_C_COMPILER=&lt;C compiler&gt; -DCMAKE_CXX_COMPILER=&lt;C++ compiler&gt;</code></li>
     <li><code>make omp</code></li>
   </ul>
 
   <p>Out-of-tree build:</p>
   <ul>
-    <li><code>cd where-you-want-to-live</code></li>
-    <li>Check out openmp</li>
-    <li><code>cd where-you-want-to-live/openmp</code></li>
-    <li><code>mkdir build &amp;&amp; cd build</code></li>
-    <li><code>cmake path/to/openmp -DCMAKE_C_COMPILER=&lt;C compiler&gt; -DCMAKE_CXX_COMPILER=&lt;C++ compiler&gt;</code></li>
+    <li><code>cd llvm-project</code></li>
+    <li><code>mkdir build-openmp &amp;&amp; cd build-openmp</code></li>
+    <li><code>cmake ../openmp -DCMAKE_C_COMPILER=&lt;C compiler&gt; -DCMAKE_CXX_COMPILER=&lt;C++ compiler&gt;</code></li>
     <li><code>make</code></li>
   </ul>